package cn.wolfcode.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {

    public static String sendGet(String url) {
        String result = "";
        BufferedReader in = null;
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接  
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性  
            connection.setRequestProperty("accept", "*/*");  
            connection.setRequestProperty("connection", "Keep-Alive");  
            connection.setRequestProperty("user-agent",  
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");  
            // 建立实际的连接  
            connection.connect();  
            // 获取所有响应头字段  
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段  
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }  
            // 定义 BufferedReader输入流来读取URL的响应  
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));  
            String line;
            while ((line = in.readLine()) != null) {  
                result += line;  
            }  
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();  
        }  
        // 使用finally块来关闭输入流  
        finally {  
            try {  
                if (in != null) {  
                    in.close();  
                }  
            } catch (Exception e2) {
                e2.printStackTrace();  
            }  
        }  
        return result;  
    }  
  

    public static String sendPost(String url) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {  
            URL realUrl = new URL(url);
            // 打开和URL之间的连接  
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性  
            conn.setRequestProperty("accept", "*/*");  
            conn.setRequestProperty("connection", "Keep-Alive");  
            conn.setRequestProperty("user-agent",  
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");  
            // 发送POST请求必须设置如下两行  
            conn.setDoOutput(true);  
            conn.setDoInput(true);  
            // 获取URLConnection对象对应的输出流  
            out = new PrintWriter(conn.getOutputStream());
            // flush输出流的缓冲  
            out.flush();  
            // 定义BufferedReader输入流来读取URL的响应  
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {  
                result += line;  
            }  
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();  
        }  
        //使用finally块来关闭输出流、输入流  
        finally{  
            try{  
                if(out!=null){  
                    out.close();  
                }  
                if(in!=null){  
                    in.close();  
                }  
            }  
            catch(IOException ex){
                ex.printStackTrace();  
            }  
        }  
        return result;  
    }

}